New hero crazy prediction
Green - Nero (DMC4), a lot of the Order of the Sword characters are Green cards so he is a good fit. I was going peg him as a red hero but Jill took that spot.
Purple - Strider Hiryu (Strider), I had picked Zero for that role initially, but I suspect the new hero characters would not have existing cards. Plus he's a ninja so that fits the purple deck archetypes.
Black - Grigori (Dragons Dogma), this is the biggest longshot bet. Dragon's Dogma has enjoyed decent treatment from Capcom by being ported to several next gen consoles. It has gotten good reputation among fans and I'm pretty sure Grigori was cited as a fan favorite boss fight. At the very least he's the face of the series for now...Probably. Unlike a fighting game, you can definitely include a 50m Dragon as a card game hero